Lamp-socket.



l shell together and also yheee-,isre

Application filed Novem'ner fra, 1914,

To all 'whom t may concern:

Be it known that l, CHARLES J. KLEIN, a citizen of the United States, residing at Mil- Waukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Lamp-Sockets, of Which the following is a full, clear, c0noise, and exactdescription, reference being had tothe accompanying drawing, forming a part of this specification.

This invention relates to casings for electrical devices and more particularly to meansfor interlocking the sections of casings for lamp sockets, pendent switches and the like.

One of the objects of the invention is to provide convenient and eliicient means for locking a lamp socket cap and shell against axial separation and relative rotation. t

Further. objects and advantages will appear hereinafter in comiecticn with the desoription of the accompanying drawing which shows a typical embodiment of the invention.

ln the drawing,

Figure l is an elevational view, partially in sect1on, of an electric lamp socket.

Fig. 2 a bottom view ot the easing cap,

and

Fig. 3 is a perspective 'View of the casing shell and cap separated, the latter being partially broken away.

Referring more speciically to the dravving, the casing comprises a cap l and a shell 2 designed to telescope together4 and house a suitable insulating base 3 adapted to carry the electrical conducting parts of the socket or other device. interlocking means are provided to hold the cap and to restrain the same against relative rotatie.

As illustrated the cap l comprises a dome shaped body portion having a depending rim l with an out-turned flange 5, and a collary 6 encircling the rim 4b and held thereu on by intnrned annular hanges 7 and 7a. The collar 6 is thus rmly maintained against removal from the cap lout free to rotate thereon. The cap rim 4 is also provided with rectangular slots 8 preferably arranged at diametrically opposite points, and the rotatable collar 6 is provided with similar equi-dimensional slots 9 in its llange Specification of Letters Patent. lltgfjigwttgifl New, jt

7. is illustrated in Fig. 3, when notI lar 6 is rotated to anne the slots 9 am openii are thereby formed to receive sli lugs, il appear.

The nip cket shown is provided 'with a switch mechanism having double ended push button operating member and to cominodnte the push buttons the casing shell 2 has oipositely disposed` slots l0 in its up per margin. rlhe edges of these recesses contiguous tothe shell edge are ont-'turned to provide four radial lugs ll having abrupt lower shoulders l2. ,The insulating base 3 which carries the switch mechanism also provided with" integral portions i3 located directly above the push buttons and of a dimension 'to snugly fit between the shell lugs ll so that the base is anchored against rotation relative to the shell.

Assembly and locking oi the parte is effected as follows: The cap ring 3 pcsi'tioned to aline the slots 8 and 9 whereupon the shell 2, with its base 3 therein, is turned to aline the lugs .ll with the openings in the cap margin so that the parts may be telescoped together. is apparent that tlieliat outer sin 'e the lugs ll engage the ont metal lges the cap rini 4 at the slots 8 so that the shell., and consequently the base 3, is locked against rotation relative to the cap The collar 6 is vthen turned nntil the lower flange T moves beneath the lugs l1 and the hase projections 13 whereby the lint upper snrface of said flange 7 engages the cut metal shoulders 12 ol the lugs ll and holds the shell and the base against axial removal :from the cap.

Sepa-ration of the parts is obviously ef- :feet-ed by rotating the cap collar so that the flange 7 clears the shell lugs ll whereupon the latter may be withdrawn. lt is to be noted that primary positioning` of the l upon the. lixture may be effected at any desired relative an@ for the operating member of the switf and that thereafter the shell may be .f adily telescoped and locked by a slight tina; ot the locking ring 6.

What l claim as new and desire to secure by Letters Patent isn*- l. ln combina-tion, a cap and Shell to telescope and havin portions interlocking upon telescoping tlmeot to prevent relative ro- During this operation it o tation therebetween and means on one of said parts rotatable relatively thereto tor locking said parts against separation.

2. ln combination, a cap and shell to telescope and having portions interlocking upon telescopingthereof to prevent relative rota.- tion therebetween and means on the exterior ot' one of said parts and rotatable relatively lthereto for locking said parts against separation.

3. .ln Combination', a cap and shell to telescope and having shoulders cooperating upon telescoping thereofto lock the same against relative rotation and a member onone of said parts rotatable relatively thereto to lock the saine against separation.

In combina-tion, a cap and shell to telescope and interlock against rotation, -a xed shoulder on one of said parts and a member on the other of said parts rotatable relatively thereto or engaging said shoulder to lock said parts against separation.

5. ln. combination, a cap and shell to telescope together, means to lock the same against relative lnoveme it in one direction as telescoped, and rotatable means to lock the same against movement in a right angled direction after telescoping.

6. ln combination, a cap having a marginal slot, a shell having a shoulder to enter said cap slot and engage an edge wall thereof, and a member on said cap rotatable relatively thereto and having an inturned portion to underlie said cap slot engage said shell shoulder for supporting the saine.

7. ln combination, a eap having a marginal slot, an annulus surrounding said cap and having a notch to'register With said slot, a shell for telescopic engagement with said cap and having a shoulder to enter the Slot in said cap through the notch in said annulus, said annulus being rotatable with respect to said cap to lock said cap and shell against separation.

8. 4In combination, a cap having a flanged and slotted periphery, an annulus flanged about the periphery of said cap and having a notch to register With the Slot therein, a shell for telescopic'engagement with said cap and having a shoulder to enter the slot in said cap through the notch in said ann nulus for' engaging the Walls of the slot thereby preventing relative rotation of said shell and cap, said annulus being rotatable with respect to said cap to lock said shell and cap against separation.

In Witness whereof, I have hereunto subscribed my name 1n the presence of two Witnesses.

CHARLES J. KLEIN.

Witnesses:

H. WATSON, TEKLA BAsT. 

